When to plant tomatoes in Bielefeld: 13 May – 29 July

In Bielefeld, tomato: sow for seedlings from 1 March to 7 June; plant into a greenhouse from 22 April to 29 July; plant out into open ground from 13 May to 29 July. For plants and seeds, the places nearby include Blumen Klose (garden centre, 2 km) and Gartencenter Mühlenweg (garden centre, 5 km); addresses and opening hours are below.

Tomato in Bielefeld: soil, season and weather

In Bielefeld the soil, not frost, sets the date: the last frost is over around 20 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 13 May, 23 days later.

Last spring frost	20 April
Top 7 cm of soil at 15 °C	13 May, 23 days after the last frost
Into an unheated greenhouse	22 April – 29 July; April outside: 4.3 °C at night, 14 °C by day; card 16–27 °C
First autumn frost	18 November, 189 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	22 July – 7 October
Days left for picking	119
Daylight	12:16 on 22 March, 15:33 on 13 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, May, has 12 rainy days

Tomato in Bielefeld: care after planting

Planted on 13 May: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

13 May — feed: balanced (NPK)
10 June — feed: nitrogen

Pests and diseases of tomato to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Bielefeld during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 23.8 °C. Months that stay below 16 °C even by day on average: October (14.9 °C) and November (9 °C). Nights average below 16 °C in every month of the season, from 3.5 °C to 14.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	18.6	8.4	62	12	15:40
June	22.8	12.9	72	12	16:42
July	23.3	13.8	78	14	16:17
August	23.8	14.2	66	14	14:43
September	20	11.1	63	11	12:43
October	14.9	8.3	84	15	10:44
November	9	3.5	70	14	8:50

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Bielefeld, Münster is 2 days earlier and Bremen 4 days later.

City	Distance	Date	Difference
Münster	62 km	11 May – 1 August	2 days earlier
Hanover	91 km	15 May – 1 August	2 days later
Dortmund	92 km	16 May – 27 July	3 days later
Bochum	108 km	13 May – 31 July	same day
Bremen	119 km	17 May – 30 July	4 days later
Essen	122 km	11 May – 1 August	2 days earlier

Where to buy tomato plants and seeds near Bielefeld

Buy plants ready to set out from 13 May to 29 July (from 22 April to 29 July for an unheated greenhouse); seed for raising your own is sown from 1 March to 7 June. Within 15 km of Bielefeld OpenStreetMap lists 23 garden centres, 1 farm-supply shop, 2 plant nurseries, 13 markets and 26 farm shops (collected 28 October 2026).

Krull — garden centre
Haller Straße 150, 33334 Gütersloh · Tue–Fri 08:30–18:30; Sat 08:00–14:00 · 12 km · krull-pflanzen.de
Tiega - Tier- und Gartenwelt — garden centre
Heideblümchenstraße 59, 33758 Schloß Holte-Stukenbrock · Mon–Fri 09:00–19:00; Sat 09:00–16:00 · 12 km · tiega.de
Blumen Klose — garden centre
Oldentruper Straße 84a, 33604 Bielefeld · Mon–Fri 09:00–18:00; Sat 09:00–14:00; Sun, public holidays 10:00–12:00 · 2 km · blumenklose.de
Gartencenter Mühlenweg — garden centre
Südring 9, 33647 Bielefeld · Mon–Fri 09:00–20:00; Sat 08:00–20:00; Sun 10:00–15:00 · 5 km · gartencenter-muehlenweg.de

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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